cmark-gfm is GitHub's extended version of the C reference implementation of CommonMark. Prior to versions 0.29.0.gfm.3 and 0.28.3.gfm.21, an integer overflow in cmark-gfm's table row parsing `table.c:row_from_string` may lead to heap memory corruption when parsing tables who's marker rows contain more than UINT16_MAX columns. The impact of this heap corruption ranges from Information Leak to Arbitrary Code Execution depending on how and where `cmark-gfm` is used. If `cmark-gfm` is used for rendering remote user controlled markdown, this vulnerability may lead to Remote Code Execution (RCE) in applications employing affected versions of the `cmark-gfm` library. This vulnerability has been patched in the following cmark-gfm versions 0.29.0.gfm.3 and 0.28.3.gfm.21. A workaround is available. The vulnerability exists in the table markdown extensions of cmark-gfm. Disabling the table extension will prevent this vulnerability from being triggered.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade pandocUpgrade pandoc-common | Jul 22, 2022 | Mar 3, 2022 |
| Debian | — | Upgrade ruby-commonmarkerUpgrade r-cran-commonmarkUpgrade python-cmarkgfmUpgrade ghostwriterUpgrade cmark-gfm | Jul 30, 2024 | Mar 3, 2022 |
| Redhat_linux | — | Upgrade pandoc-commonUpgrade pandoc | Dec 15, 2023 | Mar 3, 2022 |
| Rocky_linux | — | Upgrade pandoc | Jun 29, 2026 | Jun 28, 2026 |
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